Using Shared Preferences in Setting Screen

Hi Guys I'm back! Today, My topic is all about Shared Preferences of Android. What is Shared Preference? a class that allows you to save and retrieve persistent key-value pairs of primitive data types(booleans, floats, ints, longs, and strings). This sample code may give you idea how to use Shared Preference in your Android App Projects. I used Shared Preference in saving my Settings, The scenario is if the user wants to save his/her setting in the app for example, turning on/ turning off the Music, Sounds and Updates. Note: This data will persist across user sessions (even if your application is killed).

import android.app.Activity;
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Switch;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    Switch musicSwitch;
    Switch soundsSwitch;
    Switch updatesSwitch;

    Button saveBtn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        musicSwitch = (Switch) findViewById (R.id.switch1);
        soundsSwitch = (Switch) findViewById (R.id.switch2);
        updatesSwitch = (Switch) findViewById (R.id.switch3);
        saveBtn = (Button) findViewById (R.id.buttonSave);

        setWidget();
        saveBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                savePreferences();
            }
        });

    }

    private void setWidget(){
        //Get the value of SharedPref if null return false 
        SharedPreferences customSharedPreference = getSharedPreferences("mySettings", Activity.MODE_PRIVATE);
        updatesSwitch.setChecked(customSharedPreference.getBoolean("updates",false));
        musicSwitch.setChecked(customSharedPreference.getBoolean("music",false));
        soundsSwitch.setChecked(customSharedPreference.getBoolean("sounds",false));


    }
    private void savePreferences(){

        SharedPreferences myPref = getSharedPreferences("mySettings", Activity.MODE_PRIVATE);
        SharedPreferences.Editor editor = myPref.edit();
        //Setting the value of SharedPref
        editor.putBoolean("music", musicSwitch.isChecked());
        editor.putBoolean("sounds", soundsSwitch.isChecked());
        editor.putBoolean("updates", updatesSwitch.isChecked());
        editor.commit();

        Toast.makeText(this, "Setting Saved", Toast.LENGTH_SHORT).show();
    }

}

Layouts:

<RelativeLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <Switch android:id="@+id/switch1"
        android:layout_centerInParent="true"
        android:layout_height="20dp"
        android:layout_width="wrap_content"
        android:text="Music"/>

    <Switch android:id="@+id/switch2"
        android:layout_height="20dp"
        android:layout_width="wrap_content"
        android:text="Sounds"
        android:layout_above="@+id/switch3"
        android:layout_alignLeft="@+id/switch3"
        android:layout_alignStart="@+id/switch3"
        android:layout_marginBottom="56dp" />


    <Switch android:id="@+id/switch3"
        android:layout_height="20dp"
        android:layout_width="wrap_content"
        android:text="Updates"
        android:layout_above="@+id/switch1"
        android:layout_alignLeft="@+id/switch1"
        android:layout_alignStart="@+id/switch1"
        android:layout_marginBottom="49dp" />

    <Button android:id="@+id/buttonSave"
        android:layout_height="45dp"
        android:layout_width="80dp"
        android:text="SAVE"
        android:layout_below="@+id/switch1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="58dp" />

</RelativeLayout>

Output: